// Copyright (c) 2008-2010, Arne Claus
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the 
// following conditions are met:
//
// - Redistributions of source code must retain the above copyright notice, this list of conditions and the following 
//   disclaimer.
// - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following 
//   disclaimer in the documentation and/or other materials provided with the distribution.
// - Neither the name Arne Claus nor the names of any contributors may be used to endorse or promote products
//   derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 
// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef __INCLUDED_CBL_SUBSCRIBER_H_
#define __INCLUDED_CBL_SUBSCRIBER_H_

#include <vector>
#include <map>
#include <algorithm>
#include <string>

#include "CBL_Debug.h"

CB_NAMESPACE_START

	class ISubscriptionHost;

	// ---------------------------------------------------------------------------------------------------------------------
	//	ISubscriptionListener
	//	Derive a class that want's to subscribe itself to events of a Subscription host from this class.
	// ---------------------------------------------------------------------------------------------------------------------

	class ISubscriptionListener
	{
	public:
		
		BASELIB_API virtual ~ISubscriptionListener();	
		virtual void HandleMessage(uint32 _MessageType, ISubscriptionHost& _rSender, void* _pData) = 0;

	private:
		
		BASELIB_API void OnUnsubscribe(ISubscriptionHost& _rHost);
		BASELIB_API void OnSubscribe(ISubscriptionHost& _rHost);

	private:
		
		friend class ISubscriptionHost;
		
		typedef std::vector<ISubscriptionHost*> CSubscriptionHostList;
		CSubscriptionHostList m_Hosts;
	};

	// ---------------------------------------------------------------------------------------------------------------------
	//	ISubscriptionHost
	//	A class that allows runtime subscription to certain events should derive from this class.
	// ---------------------------------------------------------------------------------------------------------------------

	class ISubscriptionHost
	{
	public:
		
		BASELIB_API ISubscriptionHost(uint32 _Size);
		BASELIB_API virtual ~ISubscriptionHost();

	public:
		
		BASELIB_API void Subscribe(uint32 _MessageType, ISubscriptionListener& _rListener, char* _pName = NULL);
		
		BASELIB_API ISubscriptionListener* GetListenerByName(char* _pName);
		
		BASELIB_API void Unsubscribe(uint32 _MessageType, ISubscriptionListener& _rListener);
		BASELIB_API void UnsubscribeListener(ISubscriptionListener& _rListener);
		BASELIB_API void UnsubscribeType(uint32 _MessageType);
		
		BASELIB_API void CallSubscribers(uint32 _MessageType, void* _pData=NULL);
		
	private:
		
		typedef std::vector<ISubscriptionListener*> CSubscriberList;
		typedef std::map<std::string, ISubscriptionListener*> CSubscriberMap;
		
		uint32				m_NumTypes;
		CSubscriberList*	m_pSubscriptions;
		CSubscriberMap		m_SubscriberMap;
	};

CB_NAMESPACE_END

#endif